Casing while drilling provides immediate benefits, saving both time and money by altering the steps needed for the drilling process. On top of this, the CwD system also provides a whole host of additional benefits. The benefits of casing while drilling can be summarized below;
Save Time and Cost
As mentioned in the introduction part, Basic Knowledge of Casing while Drilling (CwD), CwD is able to save operation time by cutting down flat time and reducing operational risk. When compared to conventional drilling, CwD can provide a time saving of between up to 37.5% of time spent on a well based on historical data from a field in Oman (136107-PA SPE Journal Paper – 2012). Continue reading
Casing while drilling (CwD) has been around for many years and it is one of proven technologies that can save both time and money. CwD is a process where a well is simultaneously drilled and cased; the casing is used for the drill string, and is rotated to the drill and cemented into the well at TD. One of the main benefits of this process is that it greatly cuts down on the tripping time needed to pull out the bottom hole assembly (BHA) and run the case- if not removing this need entirely. Therefore, the flat time is reduced, and the process is made more economically viable.
Figure 1- Casing while Drilling Operation (Courtesy of Weatherford)
As shown in Figure 2 below, which is an example of Casing while Drilling utilized in one of oilfields in Oman for drilling surface section; this process can save up to 37.5% of time spent on a well based on historical data.
Figure 2 – A comparison between conventional drilling and casing while drilling of one field in Oman (SPE 136107-PA ,SPE Journal Paper – 2012).
Mechanical properties of material are one of the most important basic concepts in a well design and this section will briefly discuss about key mechanical properties and their applications. Furthermore, there is a discussion about effect of corrosion on the mechanical performance of load carrying components.
Mechanical Properties of Material
Basic mechanical properties are as follows;
Hardness is a resistance of materials to permanent deformation and is sometimes referred to a resistance to abrasion or scratching. The greater of the hardness, the harder it is for the materials to deform. The application of hardness is to inspect if materials have been properly treated during a heat treatment process. The comparison between the actual hardness and the standard hardness of materials will show whether the current batch of material is proper and suitable for use or not.
Strength of material is an ability to work within a load without failure of the material. Tensile and yield strength are critical properties in terms of material strength.
Tensile strength or ultimate tensile strength is the maximum stress on an engineering stress-strain curve. At this point, materials are plastically deformed but they may not be broken apart yet depending on types of materials. Continue reading
Saudi Arabia has the second largest oil reserves in the world, so it is quite logical that there are several successful oil companies in this country. One of them is Saudi Aramco or simply Aramco. With a revenue of around $380 billion and value between $2 trillion and $10 trillion, Saudi Aramco is the most valuable company in the world.
One of the reasons why this company is always on top is their investment in research and development of new oilfields. Manifa oilfield is one of these new oilfields that have proven to be a great investment.
Manifa oilfield is located on a manmade island. Thanks to modern technology, engineers and architects can create artificial islands and make the production of oil much easier and simpler. Of course, in order for such manmade island to promise a good return on investment, it must be situated in shallow waters. Otherwise, it will need a lot of material to build it. At the same time, these manmade islands guarantee the improvement of long-term reservoir recovery. In addition, oilfields built on manmade islands allow the creation of more wells, don’t have negative environmental effects and it is much safer for the workers to work on an oilfield like this.
Manifa Field (Top View)
Coating the subsea pipeline with concrete is a technique to add downward force for stability of pipelines situated on the seabed. Figure 1 shows that the concrete coated subsea pipe line is being welded. This article will demonstrate how to calculate the thickness of concrete required in order to achieve the required net down force.
Figure 1 – The Concrete Coated Subsea Pipe Line is being Welded
Determine thickness of coated cement based on the given information below. Continue reading